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ParametricPlot of defined functions gives empty plot?

Aleksandr Miller
Posted 4 years ago

Hi, there! Can you please help me with a problem. I really don't understand why this doesn't work... When I create some function and then input it into my ParametricPlot, it doesn't work, but when I input the expressions explicitly, it works. The screenshots are applied below.

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POSTED BY: Aleksandr Miller
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Hans Milton
Hans Milton
Posted 4 years ago

From your screenshot it appears that the functions parX[t_] and parY[t_] returns a List enclosing an expression in t. Not the "raw" expression itself. This does not work with ParametricPlot.

Compare:

ParametricPlot[{{Cos@t}, {Sin@t}}, {t, 0, 2 \[Pi]}]

Produces an empty plot

ParametricPlot[{Cos@t, Sin@t}, {t, 0, 2 \[Pi]}]

Plots a circle as expected

So, take away the enclosing curly brackets in the function definitions.
POSTED BY: Hans Milton
Rohit Namjoshi
Rohit Namjoshi
Posted 4 years ago

Please post code, not images.

Try ClearAll[parX, parY, parZ] and then redefine them using := (SetDelayed) rather than = (Set).
POSTED BY: Rohit Namjoshi
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